How to Edit Objects Independently in a Scene?
It seems like you've joined the two objects together as one. When adding an entirely new object, you should have selected 'create new object' instead of 'add object'.

However, in this case, your objects are linked as one. To separate them, go to edit mode, and select all the vertices that you want to separate as an entirely new object (your torus), use the command P and click 'selected'.

Hope this helps!